Season 4

The Chief assigns 86 and 99 to retrieve a deadly scientific theory from KAOS. The search takes the CONTROL agents to a TV studio, where they disguise themselves as dancers.

Max and 99 stumble on SIegfried's evil plot to destroy the U.S. potato crop while visiting 99's mother in Idaho.

Max is assigned to protect CONTROL Courier Busby during a plane ride, but Busby mysteriously disappears from the bathroom in mid-flight.

Thirty years earlier bank robbers Connie and Floyd met up with Sam Vittorio, who had robbed 192 banks. Now dying, Vittorio will only reveal the location of his hidden loot to his protégés, who look remarkably like Max and 99.

KAOS is using its League of Bald Headed Men to steal diamonds and smuggle them out of the country and fund their European payroll.

Each time Smart picks a best man for his upcoming wedding to Agent 99, the man meets with a mysterious accident. The Chief deducts that there must be a link between all of the accidents and KAOS because all of Max's prospects are fellow agents. To prevent further loss of manpower a t CONTROL, Hymie is appointed best man. KAOS then reveals it's true interest in Max's choice of best man - nearly to the extinction of CONTROL.

Smart and the Chief try all the standard escape methods and each time KAOS has Seigfried and his henchman, Starker, block them. The Chief realizes that there must be an informer in the camp and devises a plan to fool the informer.

With an attempt to kidnap Admiral Hardgrade in the works, Max has him stay in his apartment.

The big day arrives for Smart and Agent 99, but almost without Smart as he is sidetracked by a bizarre case. KAOS scientist Dr. Madre passes information on the location of the Melnick uranium mine to Max, in the form of a "drinkable map".

Smart wears a new blazer given to him by a Chinese merchant, Lin Chan. Smart, however, isn't aware he posses a weapon in the blazer, and is mystified as object disappear around him.

When Agent 99 is caught without dessert, she gratefully accepts chocolate mousse from her solicitious neighbor Naomi Farkas. Naomi and her husband Emil are secret KAOS agents who hope to photograph some papers the Chief has with him.

KAOS fakes military call-up orders for Maxwell Smart and the Chief for the US Navy! Smart's restoration to the rank of Ensign makes him the Chief's superior, humiliating the Chief, who was restored to Seaman.

The Smarts' honeymoon cruise ends when their sailboat blows up. They drift to an uncharted island, which soon proves to be owned by KAOS chief Seigfried.

Max must bring a scientist, Dr. Canyon, into the CONTROL camp. His problems multiply quickly; the invisible doctor turns out to be a pretty woman whose visibility returns just as Agent 99 enters their apartment.

Max and 99 go undercover as actors Lawrence Hollywood and Viola Vain to learn how KAOS is using performances of a play to communicate with their agents.

When budget cuts hit CONTROL, 99 is on the list of agents to be laid off. She then finds a temporary job at a trading stamp redemption center, which also happens to be a KAOS munitions drop that is about to begin distribution of their latest weapon, a stereophonic pistol. 99 finds out what is going on and informs the Chief, but is captured before she can give the location. The Chief and Larabee eventually find the location, but are captured themselves. It is now up to Max to find and save them.

Smart and 99 pose as a flamenco dancer and a seedy doctor to fool KAOS as both search for hidden gems in Mexico.

Max and 99 investigate after receiving a tip that KAOS is planning to blow up an aerospace center adjoining the Pomona National Golf Club - the third such incident in less than a year.

The Chief takes up computer dating and winds up dating a gorgeous young woman. The Chief's boss (unseen) orders Max and 99 to follow the Chief to make sure that this romance is not a security risk. 99 also thinks that the Chief should be dating someone more his age, like her mother. The young woman is actually the wife of Dr. Paponickolini, who is giving the Chief a secret formula for eternal youth. The Chief arrives at Max's apartment for a dinner date with 99's mom but instead KAOS shows up and kidnaps 99's mother, thinking she's the wife of Dr. Paonickolini.

Max must hid the king of Caronia in his apartment. Agent 99 is contently getting Max and the king confused as the king is 86's double. KAOS tries to kill them by putting a tarantula in the apartment.

Max tries to test his and agent 99's relationship by dressing up like the king. In the mean time, the real king is kidnapped by KAOS. It is up to Max to rescue him.

Dr. Erick Zharko and his assistant Bruce wire Max and 99 to a Dr. Frankenstein-like apparatus. Zharko figures that a jolt of his specially controlled electricity will shock Max and 99 into a five year sleep.

Wheelchair bound mastermind Leadside is caught in a robbery by Max and announces a three-part plan. Phase one, he will escape from Max. Phase two, he will destroy CONTROL. Phase three, he will kill Maxwell Smart. After Leadside follows through on Phases One and Two, Max holes up in his apartment, vowing "Leadside will only complete Phase Three over my dead body." This is one of my favorite episodes and Ronald Long is brilliant as Leadside. "My mother gave me Norman." The wheelchair in the back of the truck bit is still side-splittingly funny.

CONTROL corners KAOS Agent Klineschmidt in a house and attempts to take him alive. Before they can do that, he manages to shoot Max in the buttocks. Forced to stay at home, Max amuses himself by using binoculars to spy on the office building across the street. The office he's watching belongs to Otto Greer, who is a government contractor. Top secret papers have been disappearing from his office so the Chief assigns 99 to work undercover as secretary to Greer. Max keeps an eye on 99's progress and discovers too late that Greer is a KAOS agent planning to kill both of them.

Max is assigned to see Agent Kendall safely on a plane to Europe. However, Kendall mysteriously disappears from the airport after being paged. When Max takes the Chief to the airport to find out what happened, the Chief also disappears after being paged.

CONTROL agents tunnel out of the KAOS POW camp à la "The Great Escape."